下列航空发动机的性能中，影响飞机复飞性能的主要是：（）.A.发_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

下列航空发动机的性能中，影响飞机复飞性能的主要是：（）.

A.发动机的可靠性

B.发动机的高空性

C.发动机的加速性

D.发动机的维护性

答案

参考答案：C

问答题简答题

发展无公害农产品的意义？

补全对话，情景问答

阅读对话，从右边方框中选择适当的句子将对话补充完整。

Anna: Hello. Dr Smith’s office.
John: Hello.     1
Anna: I’m afraid he isn’t here right now. I’m  Anna, Dr Smith’s assistant.     2
John: Yes, please. This is John. Dr Smith invited me to his daughter’s birthday party on
Saturday night.     3    I have to go to Australia on business this afternoon. I can’t come back until Sunday night.
Anna: Oh, I’m very sorry to hear that.
         4
John: Thank you. Goodbye.
Anna: Goodbye.

A. Hold on please.
B. Can I take a message for you?
C. I’ll give him the message.
D. I’m afraid I may be a little late.
E. I’m very sorry, but I can’t come.
F. Could I speak to Dr Smith, please?
G. Certainly.